A CICULAR PARTICULATE MATERIAL CONTAINING IRON CARBIDE

A CICULAR PARTICULATE MATERIAL CONTAINING IRON CARBIDE

Acicular particles are produced with an average axial ratio of 3-20 and an average size of 0.1-2 microns, and contain an Fe carbide containing Fe5C2 as main component. An acicular Fe compound having a surface pH of at least 5 and selected from acicular Fe oxyhydroxide and acicular Fe oxide, is conta...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: DAIMON SHIGEO, SHIBUYA YOSHIYUKKI
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
MAGNETS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Acicular particles are produced with an average axial ratio of 3-20 and an average size of 0.1-2 microns, and contain an Fe carbide containing Fe5C2 as main component. An acicular Fe compound having a surface pH of at least 5 and selected from acicular Fe oxyhydroxide and acicular Fe oxide, is contact with a gas containing CO or a mixture of CO and H2, at a contact temperture of 250-400 deg.C at a gas flow rate of CO, or mixture of CO and H2 of 1-1000 ml(STP)/min. per grain of acicular Fe compound. Acicular aprticles have a high coercive force and outstanding magnetic field orientation and are useful in magnetic recording media.